package javaIO;

import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

public class LargeMappedFiles {
    static int length = 0x8FFFFFF;
    public static void main(String[] args) throws Exception{
        MappedByteBuffer out  = new RandomAccessFile("test.dat","rw").getChannel().map(FileChannel.MapMode.READ_WRITE,0,length);
        for (int i = 0 ;i < length;i ++)
        {
            out.put((byte)'x');
        }
        System.out.println("Finished writing");
        for (int i = length/2;i < length/2 + 6; i++){
            System.out.print((char)out.get(i));
        }
    }
}
